File System directory of Chrome browser took a lot of disk space

When I was cleaning up my computer’s disk space, I noticed that the Chrome directory under AppData\Local\Google took almost 10 GB spaces, especially the directory File System, which is using 7.87 GB of disk space. In the File System directory, one largest directory used most of the space named 017. In this directory there are 9 very large files in it, each one is around 900 MB, and all of them were created on last November.

The “File System” directory used 7.87 GB of disk space.

After googling around, I found this article is useful:

https://www.ghacks.net/2015/06/24/hard-drive-filling-up-check-chromes-file-system-folder/

Quote: “Chrome (and Chromium) use the folder to store files stored with the help of the File System API which is part of HTML5.”

So, it looks like some web service were using File System API stored these data on the disk. But I can’t remember which website I used could take up almost 8 GB data on my disk.

Only thing I can do now is to delete these files, and monitor the File System directory frequently to see if there is any unusual amount of space used by this directory.

CentOS 7 virt-manager “authentication failed”错误及解决方法

这两天在捣鼓CentOS 7,因为之前是在Debian用KVM,于是这次照着之前的做法来一步步安装KVM,然而最后打算用virt-manager来管理的时候,发现被拒之门外了。

virt-manager error

Unable to connect to libvirt.
authentication failed: no agent is available to authenticate.

呃,真够磨人的。看着像是权限问题。尝试了下,发现root级别的qemu:///system 是出错的,不过用户级别的qemu:///session 没有问题。因为默认是以非root用户执行virt-manager的,应该是这个原因导致权限的问题。

用户级别的权限受到很多限制,要全面发挥KVM的功能还是需要root级别。不过,现在却被挡在了门外。我先是检查了各种包有没有安装,结果是该装的都装了。 Continue reading CentOS 7 virt-manager “authentication failed”错误及解决方法

Local domain suffix causing WSUS error

I have several Windows computers in my LAN, so I’m using a Windows Server as WSUS server serving Windows Updates to LAN clients. And I just flashed my router’s firmware from Tomato to OpenWRT yesterday, then I found the WSUS service broken.

“80072ee2” shows on Windows Update window, and the Windows Server Update Service remote console unable to connect to the WSUS server neither.

The 80072ee2 means there was a connectivity issue between client and server,

Continue reading Local domain suffix causing WSUS error

用iptables加强VPS防御

VPS – Virtual Private Server,也就是虚拟专用服务器。虽说是虚拟的,但是和普通服务器一样:有内存、有CPU、有HDD当然也直接接入互联网。

实话实说,网络的凶险程度一点也不比人类社会低。接入互联网的设备,无时无刻不承受着来自各方面的攻击:比如最常见的端口扫描。
Continue reading 用iptables加强VPS防御